Trying to find a quiet place to reconnect with her family during her pregnancy, Olivia, her husband Paul, and their rebellious teenage daughter Camille move to an island in Brittany. Camille witnesses strange phenomena and some of the inhabitants of the island die under mysterious circumstances. Camille and her newfound friends will risk their lives to dive into the bowels of the island, into the heart of darkness, and face demons of the past that they may be too scared — or too ashamed — to confront.